Makefile: remove deprecated cleanall target

Makefile

@@ -95,8 +95,6 @@ manifest: FORCE
 	+@$(GLUONMAKE_EARLY) maybe-prepare-target
 	+@$(GLUONMAKE) $@
 
-cleanall: clean ;
-
 else
 
 TOPDIR=${CURDIR}
@@ -353,6 +351,6 @@ manifest: FORCE
 	) :)) > $(GLUON_IMAGEDIR)/sysupgrade/$(GLUON_BRANCH).manifest
 
 
-.PHONY: all images prepare clean cleanall gluon-tools
+.PHONY: all images prepare clean gluon-tools
 
 endif

README.md

@@ -29,8 +29,7 @@ will ensure all packages are rebuilt; this is what you normally want to do after
     make dirclean
 
 will clean the entire tree, so the toolchain will be rebuilt as well, which is
-not necessary in most cases, and will take a while. (`make cleanall` is a deprecated
-alias for `make clean`)
+not necessary in most cases, and will take a while.
 
 So all in all, to update and rebuild a Gluon build tree, the following commands should be used: